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Try unplugging the mains EHU lead from the caravan. Try unplugging the EHU lead from the commando convertor.

Try switching off the main switch in the caravan.Try switching off the MCBs in the caravan. You probably have a 10Amp and a 6Amp

You're trying to remove items from the circuit until it holds in and identify the bit you plug in which causes the trip. Somewhere the live or the neutral is shorting to earth.

Could be a cross connection in the commando convertor or EHU.

Could be the microwave or charger, they are both items which can trip RCDs.

I personally wouldn't like to change the RCD to a 100mA. You are already outside the PME zone of protection and the PME earth bonded to the caravan body & chassis. The 30mA RCD is important to protect you. Add to that you have a potentially faulty piece of kit in the caravan; changing the RCD will add to the risk by downgrading a safety device.

Most electronic kit has switch mode power supplies with a functional earth leakage. With computers we try not to put more than 8 on one 30mA RCD because of nuisance tripping. It may be you just have too much so splitting it across 2 RCDs may help.